package com.hmdp.utils;


import cn.hutool.core.lang.DefaultSegment;
import cn.hutool.core.lang.UUID;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;

import java.util.Collection;
import java.util.Collections;
import java.util.concurrent.TimeUnit;

public class SimpleRedisLock implements ILock{
    private String name;
    private StringRedisTemplate stringRedisTemplate;
    public SimpleRedisLock(String name, StringRedisTemplate stringRedisTemplate) {
        this.name = name;
        this.stringRedisTemplate = stringRedisTemplate;
    }
    private static final String KEY_PREFIX = "lock:";
    private static final String ID_PREFIX = UUID.randomUUID().toString(true)+"-";
    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT;
    static {
        UNLOCK_SCRIPT = new DefaultRedisScript<>();
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }
    @Override
    public boolean tryLock(long timeoutSec) {
        //获取线程id
        String threadId = ID_PREFIX+ Thread.currentThread().getId();
        Boolean success = stringRedisTemplate.opsForValue()
                .setIfAbsent(KEY_PREFIX + name, threadId, timeoutSec, TimeUnit.SECONDS);
        return   Boolean.TRUE.equals(success);
    }
    @Override
    public void unLock() {
       //j基于lua脚本实现释放锁 保证原子性
        //调用脚本
        stringRedisTemplate.execute(
                UNLOCK_SCRIPT,
                Collections.singletonList(KEY_PREFIX + name),
                ID_PREFIX+ Thread.currentThread().getId()
        );


        }


//   @Override
//    public void unLock() {
//        //释放锁
//        //获取线程id
//       String threadId = ID_PREFIX+ Thread.currentThread().getId();
//        //获取锁中的线程id
//       String id = stringRedisTemplate.opsForValue().get(KEY_PREFIX + name);
//      if(threadId.equals(id)){
//           stringRedisTemplate.delete(KEY_PREFIX + name);
//       }


}
